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- W3136170811 abstract "Hereditary spastic paraplegia (HSP) is a clinically and genetically heterogeneous neurodegenerative disorder, characterized by lower-limb spasticity and weakness. To date, more than 82 loci/genes (SPG1-SPG82) have been identified that contribute to the cause of HSP. Despite the use of next-generation sequencing-based methods, genetic-analysis has failed in the finding of causative genes in more than 50% of HSP patients, indicating a more significant heterogeneity and absence of a given phenotype-genotype correlation. Here, we performed whole-exome sequencing (WES) to identify HSP-causing genes in three unrelated-Iranian probands. Candidate variants were detected and confirmed in the probands and co-segregated in the family members. The phenotypic data gathered and compared with earlier cases with the same sub-types of disease. Three novel homozygous variants, c.978delT; p.Q327Kfs*39, c.A1208G; p.D403G and c.3811delT; p.S1271Lfs*44, in known HSP-causing genes including ENTPD1, CYP7B1, and ZFYVE26 were identified, respectively. Intra and interfamilial clinical variability were observed among affected individuals. Mutations in CYP7B1 and ZFYVE26 are relatively common causes of HSP and associated with SPG5A and SPG15, respectively. However, mutations in ENTPD1 are related to SPG64 which is an ultra-rare form of HSP. The research affirmed more complexities of phenotypic manifestations and allelic heterogeneity in HSP. Due to these complexities, it is not feasible to show a clear phenotype-genotype correlation in HSP cases. Identification of more families with mutations in HSP-causing genes may help the establishment of this correlation, further understanding of the molecular basis of the disease, and would provide an opportunity for genetic-counseling in these families." @default.
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- W3136170811 date "2021-03-26" @default.
- W3136170811 modified "2023-10-02" @default.
- W3136170811 title "Description of clinical features and genetic analysis of one ultra-rare (SPG64) and two common forms (SPG5A and SPG15) of hereditary spastic paraplegia families" @default.
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- W3136170811 doi "https://doi.org/10.1080/01677063.2021.1895146" @default.
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